Skiving-machine



2 SheetsSheet 1.

(No Model.)

B. P. DUNHAM. SKIVING MACHINE.

No. 586,308. Patented July 13, 1897-.

Ems PETERS ca. mmuma. wASumC-YON. n. c.

( MOdRU 2 Sheets-Sheet 2;

B. P. DUNHAM. SKIVING MACHINE.

No. 586,308. Patented July 13,1897;

mmmnm man M flfadzmw UNITED STATES PATENT QEEICE.

BENJAMIN F. DUNHAM, OF BROCKTON, MASSACHUSETTS.

SKIVING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 586,308, dated July 13,1897.

Application filerl March 17, 1897.

To all whom it may concern.-

Be it known that I, BENJAMIN F. DUNHA-M, of Brockton, in the county ofPlymouth and State of Massachusetts,have invented certain new and usefulImprovements in Skiving-Machines, of which the following is adescription sufficiently full, clear, and exact to enable those skilledin the art to which it appertains or with which it is most nearlyconnected to make and use the same.

This invention has relation to that kind or class of machines forskiving leather used in the manufacture of boots and shoes, harnesses,&c., commonly known to the trade as Amazeen skiving-machines, whichemploy in their construction a feed-roll,a feed presserdisk, a cuttingor skiving disk, and a guide or guides.

It is the object of the invention to so reorganize machines of the classmentioned as that the same may be greatly simplified in theirconstruction, and hence cheapened in the cost of their manufacture andrendered ready of use by less highly skilled labor than it has beennecessary heretofore to engage for the purpose.

It is also the object of the invention to provide improved means ofadjustingthe parts needing adjustment relatively to each other, wherebythe machine is rendered more efficient than heretofore, and whereby alsoa la borer of ordinary skill may use the machine to perfection.

To these ends the invention consists of the improvements which arehereinafter set forth in detail and are then pointed out withparticularity in the claims hereto appended.

Reference is to be had to the annexed drawings, and to the letters andnumerals marked thereon, forming a part of this specification, the sameletters and numerals designating the same parts or features, as the casemay be, wherever they occur.

Of the drawings, Figure 1 is a perspective view of my reorganized orimproved machine, the driving-belts being omitted from the illustration.Fig. 2 is a front view of the rotary cutter and the guides and theadjuncts of and parts for supporting the cutter and guides. Fig. 3 is atransverse vertical sectional view of Fig. 2, drawn to a larger scale,showing the Serial No. 627,980. (No model.)

manner of adjusting the rotary cutter to vary the degree of stunt orbluntness of the scarf made by it.

In the drawings, a designates the bed of the machine, in which issuitably journaled the feed-shaft b, operated by a pulley c and providedwith the usual or a suitable feed-roll d.

e is the feed-disk, mounted, as is usual in this class of machines, uponthe lower end of a Vertical rotary spring-pressed shaft, so that it maypress the leather being acted on upon the feed-roll.

f is the rotary cutting'disk or knife, which is secured to the lower endof a vertical rotary shaft, which shaft I arrange in a stationary sleeve9, set at its lower end in a recess formed in the upper side of the hubof the knife or cutting-disk, all as is shown and described in LettersPatent granted to me May 26, 1891, No. 452,996.

h designates a bracket supporting the stationary sleeve, rotaryknife-shaft and knife, and immediate adjuncts. From the said bracketthere project two collars 2' i, the former, i, being interiorly threadedand formed as a pinch-collar provided with a split ear 9', through whichis passed a thumb-screw j to set or pinch the said collar as tightly asneed be on the sleeve. At the point where the sleeve 9 passes throughthe said collar it is exteriorly threaded to match the threadedpinch-collar, and on the upper end of the sleeve there is a milled diskor head 70, so that by turning the said sleeve in the pinch-collar theknife may be adjusted up or down relatively to the material being actedupon, so as to regulate the depth of cut made by the knife.

It will be understood that the knife-shaft may be rotated by the pulleyZ, operated by a belt, the said pulley being secured to the upper end ofthe said shaft.

The bracket h, which supports the rotary knife or disk f, is pivot-allyconnected, as at m, at its lower end with the free end of theoverhanging arm n, which extends up and forwardly from a base-plate 0.The pivotal axis m is on a plane coincident with the lowermost point ofthe axis of the cutting-disk or knife f, as will be clearly seen by aninspection of Fig. 3.

The bracket h at its upper part is provided with a thumb set-screw p,tapped therein, with the shank thereof extending through a slot q in thearm n. \Vith this construction it will be seen that the bracket h may beswung to a limited extent on its pivot m, so as to tip or incline theknife or move it to horizontal position and then fix and-maintain it insuch position, and, moreover, it will be seen that in this adjustment ofthe knife the center of its lower face will not be at any time moved outof a plane coincident with its pivotal point or axis m. Again, the axisor center of the lower face of the cutting-disk, however the said diskmay be inclined or tipped, does not vary as to position vertically withrespect to its relation to the feed-roll, and, moreover, the center ofthe cutting-disk is not moved to an appreciable extent out of thecentral line of'the scarf made upon the goods. This is an importantfeature of the invention.

It will be understood, of course, that the variation in the inclinationof the knife is for the purpose of varying the stunt or bluntness orsharpness of the scarf made by the knife.

It is known by those skilled in the art that the skiving is done only onthat part 2 of the feeding-roll which is milled, and that on the part orportion 3, which is offset or smaller in diameter thanIthe portion 2,noskiving is done. Hence in providing for the depth of the scarf byadjusting the knife up and down and for the degree of stunt of the scarfby varying the inclination or tip of the knife the width of the scarfmust also be provided for, and this is done by the usual edge-gage 'r,attached (adjustably, if need be) to the bedplate 0. Extending over thegage r is the finger s, which serves to keep the goods down in positionon the feed-roll that they may be properly acted upon by the knife. Thisfinger is also secured to the bed-plate.

The arm n is connected with the bed-plate through the medium of a studt, having a bearing to in said bed-plate, and the said stud is madeadjustable longitudinally by means of a thumbscrew '1), so that as theknife wears away it may be adjusted backward and forward with relationto the feed-roll in order to keep it in proper position for skiving.

w designates a steadying-pin extending from a' projection n on the arm'22 through a stud w on the bed-plate. This is for the purpose. ofinsuring that the arm '12 may not turn on the stud i when being adjustedbackward and forward.

The bed-plate 0, to which the cutter and gages are attached, is securedto the frame or bed a, so as that it may be longitudinally adjustedthereon, and this maybe done by a set-screw 03 passed through a slot yin the bed a, as is clearly portrayed in Fig. 1.

It will now be observed that to adjust the gage r, so as to vary thewidth of the scarf, it will be necessary to adjust the bed-plate 0longitudinally on the bed a, and this adjustment will carry with it inunison-that is, to exactly the same extent-the knive or rotary cutterand its adjuncts as well, and it is this feature that forms the mostimportant part of the invention. Oncehaving set the cutter to suit aparticular class of work,the width of the scarf is regulated byadjusting the bed-plate 0, which carries the knife, as well as the gager, with it.

So far as I am aware I am the first to adjust the knife and gage andtheir adjunctsin unison and by a single operation, and I do nottherefore confine myself to the particular means by which this end isaccomplished.

The maintenance of the center of the knife to all intents and purposesin its operation on the central line of the scarf and the simultaneousand uniform adjustment of the knife and gage and their coacting partsare of the essence of the invention, and I have therefore not thought itnecessary to show or describe more than one practical way ofaccomplishing these ends, notwithstanding the fact that I recognize thatthe ways in which these things may be carried out may be varied fromwhat I have shown by mechanics of ordinary skill.

I have not thought it necessary to describe the functions of the variouspulleys and other operating parts shown in Fig. 1, since these are sowell understood in the art as not to need description herein.

Having thus explained the nature of the invention and described a way ofconstructing and using the same, though without attempting to set forthall of the forms in which it may be made or all the modes of its use, itis declared that what is claimed is 1. In a skiving-machine, a rotaryknife or cutter and its support and means for adj usting the angle orinclination of knife without varying the position of the center of thesame, as set forth.

2. In a skiving-machine, the combination, with the feed-roll, of arotary knife or cutter, and means for adjusting the same at varyingangles without varying the position of the center of the cutter withrelation to the feedroll, as set forth.

3. In askiving-machine, the combination, with the rotary knife or cutterand its shaft, and means for supporting said shaft, said means being inturn pivotally supported on a plane coincident with the center ofthelower face of the knife, as set forth.

at. In a skivingmachine the combination, with the rotary knife or cutterand its shaft, means for supporting said shaft, said means being in turnpivotally supported on a plane coincident with the center of the lowerface of the knife, andmeans for clamping the support for the shaft infixed position.

5. In a skiving-machine, the combination, with the feed-roll, of therotary knife or cutter, a gage, and a bed-plate to which the knife andgage are attached, said bed-plate being adjustable longitudinallywhereby the parts mentioned may be adjusted in unison and at oneoperation, as set forth.

6. In a skiving-machine, the combination with the rotary knife or cutterand the gage, of means for adjusting the same in unison and at oneoperation, as set forth.

7. In a skiving-machine, the combination with the rotary knife or cutterand its shaft, of the overhanging arm supporting the same,

the stud t to which the said arm is connected and the screw 41 foradjusting the said stud, as set forth.

In testimony whereof I have signed my 15 name to this specification, inthe presence of two subscribing witnesses, this 6th day of March, A. D.1897.

BENJAMIN F. DUNHAM.

\Vitnesses:

ARTHUR W. CRossLEY, ARTHUR F. RANDALL.

